I can load files/folders, select tracks, and preview the song by pressing Spacebar - but can't see any tags/info. Notice in the screenshot below, I have a track selected and at the bottom, it shows the track time/size of the selected track. It also shows 68 files loaded.
That's what I thought also, but filters are off (unless I'm missing something). Otherwise, all the tracks are actually "listed" in the window, I can arrow up and down, selecting each track, I just can't see any data/mp3tags.
NOTES:
I also tried deleting and re-installing MP3TAG from the App Store with the same result.
FILTERS ARE OFF: Unless there's something else I need to do to turn them off?
MORE NOTES:
To narrow down the problem, I threw the audio files into Apple Music, Serato, Traktor and djay Pro; all the audio files are working fine in those programs. I can edit the MP3 tags in Apple Music, Serato and Traktor just fine.
Perhaps there are some APE tags hiding in there? If you select any line and open the Enhanced tag editor, it should show you what types of tags are there. If there is even one field that is APE, it will override the id3 ones in the display.
The Active checkbox was unchecked just for the Filename. These are brand new files without any info tags at all - except for the Filename, which is why "nothing" showed up - there wasn't anything else to show.